Lenses

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Optical quality
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Cons: Colour rendition is quite 'pastelly', especially with blues, not great for a wide angle where you are almost always going to want sky in the frame .... Colour, for an L lens, is a little weak in general. Chromatic abberation can rear its ugly little head on occasion. Build quality is, again, for an L lens, poor, having a light, plasticky feel no better than a standard kit lens.

Pros: The lens is otherwise quite well behaved and image quality, whilst not fantastic, presents no issues in the field. Does its job well.

Summary: Whilst the lens does its job perfectly well (used with a 7D) the kind of qualities you would expect with an L lens are simply not there. Build quality is the biggest let down. You expect L lenses to excel. This merely does the job expected from it. The sigma version does a very similar job at a lower price

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Cons: Plastic feel, not sharp at any focal length, obvious decentering, poor quality control, exorbitant pricing.

Pros: I was able to return it for full refund.

Summary: I have been both a professional and amateur photographer for over 40 years so I've owned a lot of equipment. I'm a pretty fair judge of lens performance and I tend to give equipment makers a lot of credit for their work. It pains me to write this review since I've been a Canon user for about 14 years and I've always had the utmost respect for the company and their products. I'm sure I received a defective lens since decentering was obvious and there was no aperture or focal length at which the images were even close to being sharp. (Is this to be expected of quality control these days?) Initially, I intended to exchange it for another copy of the same lens. But, the more I handled it, the build quality of this lens completely turned me off. It's priced about the same as the 17-40L but shares no build characteristic whatsoever with any L-series lens. It's not even as well made as many of my old lower priced EF consumer zooms. It is flimsy-made and seems highly fragile--about the same build quality as the cheap 18-55 kit zooms I own but do not use. It would be overpriced at half what I paid for it. I returned it immediately for a refund.

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Cons: Mi sembra poco nitido confrontato ad altre ottiche con lunghezza focale simile.

Pros: Leggero e divertente.

Summary: Consigliato

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Cons: Build quality from light plastic and feel cranky

Pros: Superb quality of lens even I compared with 17-40 F4L picture output are very sharp. The wide range 10mm are the most often use. I never use another range of zoom except 10mm. I can capture image without using viewfinder from camera.

Summary: Satisfied

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Cons: pricey, no lens hood

Pros: excellent IQ, fast & accurate AF, lightweight

Summary: highly recommended

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Cons: Complete lack of sharpness away from centre, at apertures at least below f11. The cost - my kit lens gives better quality images.

Pros: Wide angle.

Summary: Poor image quality and the price!!

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Cons: Terribele amount of Chromatic Abberation in corners and overall unusuable corners due to total lack of sharpness even at F8 - F11. I've returned my copy to Canon and am waiting for their verdict. Used on Canon 60D. It could be that this lens simply isn't good enough for 19 mexapixels. I've owned a Nikon 12-24 which was much better in every aspect!

Pros: lightweight, flare resistance, nice sunstar

Summary: Avoid this lens at all costs and go for the Tokina 11-16 which is beter at alomst al points except flare resistance

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Cons: Parasol not included and of enormous size. High price.

Pros: Low distortion, good construction, pity not creating constant width. Good saturation and color, fast, quiet, and effective AF (EOS 20 d and 50D).

Summary: Indispensable for landscape. Highly recommended.

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Cons: Too expensive for what it is. Too dim (f/2.8 would be a nice starting point for a zoom). Not nearly as sharp as Tokina 11-16.

Pros: Lightweight. Fast and accurate AF though.

Summary: Mediocre UWA for crop sensor cameras.

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Cons: no cons

Pros: for a wide zoom: excelent!

Summary: used for VR and arquitecture

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Cons: Some CA. A little pricey.

Pros: Small, light, great colors, little distortion for a WA lens. Good sharpness for a WA zoom lens.

Summary: Good WA lens with high quality glass.

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Cons: Terrible chromatic aberration and edge sharpness, even for such a short length - the lack of sharpness was visible anywhere off centre (not even mentioning the corners) on a postcard offset print! Terrible build quality: the lens broke in half when dropped 10 inches in a padded case and was refused a warranty repair by Canon Australia. Very expensive. No lens hood.

Pros: Very wide at the short end and extends to almost a "normal" length i.e. 35-50mm film. It is ideally suited for my dramatic close-up and wide shooting style. Fast autofocus.

Summary: I was very disappointed to have such poor performance for such a well-reviewed lens - so much so that I thought I may have a faulty lens. However, Canon Australia have confirmed, when it was repaired, that there was no fault. This lens was so expensive and problematic that I have changed systems!

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Cons: f 4.5 on the long end makes AF hunt in low light

Pros: sharp, fast AF, smooth zoom, low distortion

Summary: one of Canon's best - skip the lens hood as it's silly looking and the 10-22 is very flair resistant

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Cons: lack of a lens hood. this is an "L". I don't care Canon didn't name it like that. So why they don't think to give us an hood?

Pros: everything. Great lens indeed! Very sharp and well corrected. Great colors. Happy to be able to avoid to shoot at f 8 in order to get a great picture. I own a 50d, which is quite sensitive to little apertures, and what I get shooting at f4-5,6 totally satisfy me.

Summary: Buy it!

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Cons: Corner fringing, no hood, layout of focus and zoom rings different from other Canon zooms

Pros: Very wide, rectilinear, good colours, light weight, great performance at f/8.

Summary: Spectacular performance at f/8, whatever the focal length. If someone had told me 20 years ago I'd be using a lens like this I would have laughed at them. A few corner CAs but very correctable in Ps.

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Cons: bit expensive, some CA´s, lenshood missing

Pros: strong resolution (the corners are a bit more week), nearly without distortion, nearly without light falloff, easy to handle, good design and of course 10mm, which is really greaaaat, nice colours

Summary: reading the "Mr. goose" so I think the guy was really drunk or bought a rippoff-copy - all is nonesense, this is a really great lens, a bit expensive, but the allround-quality do justify the prize. Its a great, very wide lens, get one for the 7 D, 60,50,40 D!

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Cons: dull colors, significant CA

Pros: small size

Summary: not worth the money

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Cons: The usual: no lens hood. Filters are expensive at this size.

Pros: Very sharp and not a great deal of distortion, even at the wide end if you keep the lens on centre to subject. This lens excels in keeping CAs down to a minimum and in providing sharp, contrasty results throughout its range. Smooth focus action, very good build quality.

Summary: A little pricey but highly recommended if you want ultra-wide. That said, I find I do not use this lens as much as I thought I would as I find the more natural perspective at 17mm (27mm 35mm equivalent) onwards best for landscapes etc. But if you want wide for interiors and special effects this lens is essential. For the money this is a 5 star quality lens.

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Cons: no lenshood!!! normal but stabil construction, some CA´s, corner-rendition sometimes a bit week (f3.5-5.6) but that´s quiete normal for UWA, price for a new one

Pros: Very sharp (in the center may be the best UWA on the market, only the Tokina 11-16 come close), few vignetting (from f5.6), very few corner-distorsion, colour-rendition is similar to L-lenses, light-wight, easy tu use

Summary: Optics are really brilliant (always knowing whats possible with an UWA), construction is average but solid. The negative point: Price for a new one and what happens with the lenshood??? (moneychunker from Canon....)

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Cons: Little soft even when stopped down in darker situations; some weaknesses at short end (e.g. strong vignetting); some CAs; not always reliable AF on my 40D. Tubus slightly whobbling, but fortunately not extending too much; lens hood very large and expensive

Pros: Fast AF; more reliable in sunlight, then also very sharp. Very useful range. Build quality ok.

Summary: A still good (good-weather) lens, even if a little expensive.

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Cons: Lens hood too big. Corners alittle soft wide open. Expensive.

Pros: Very sharp once stopped down. Well made. Fast AF

Summary: An excellent lens for APS sensors -light weight and smooth operation.